// 变量css

@function px2rem($px, $base-font-size: 28px) {
    @if (unitless($px)) {
      @warn "Assuming #{$px} to be in pixels, attempting to convert it into pixels for you";
      @return px2rem($px + 0px); // That may fail.
    } @else if (unit($px) == rem) {
      @return $px;
    }
    @return ($px / $base-font-size) * 1rem;
  }

$main-color:#1890ff;
$screen-sm:768px;
$screen-md:1024px;

